Parallel Universe

if parallel universe are real... means according to schordinger equation..many possible states..then when we chose any one state..then other options or i mean possible states would dissolve into one single option whom to chose... or remains present as a reality...????

There is nothing in the many worlds interpretations of QM which implies a 'choice'.
Also the many worlds' interpretations are not the only interpretations, there are others which do not require many worlds.
Even those interpretations which do involve many worlds do not necessesaraly imply that actual physical realisations of alternative realities exist.
The alternative worlds can be just 'possibilities'.

There is nothing in the many worlds interpretations of QM which implies a 'choice'.
Also the many worlds' interpretations are not the only interpretations, there are others which do not require many worlds.
Even those interpretations which do involve many worlds do not necessesaraly imply that actual physical realisations of alternative realities exist.
The alternative worlds can be just 'possibilities'.

when we say any electron will be in many possibile states..then it means many parallel worlds here

As you can see its simply an extension of probability theory. And just like in probability once an outcome occurs, eg throwing a dice, that's it, the outcome occurs and the rest are irrelevant. But there are some interpretations that say - no - each possible outcome is a separate world and what happens is simply we experience that world. Even in standard probability theory you can take that view - it would be a very weird view to take - but you can do it. The reason its taken seriously in QM is it turns out to be very beautiful and mathematically elegant - but it's not to everyone's taste - including mine.